A fidget spinner is a type of toy;whose marketers claim it relieves stress. A basic fidget spinner consists of a bearing in the center of a design made from any of a variety of materials including brass;stainless steel;titanium;copper and plastic. The toy has been advertised as helping people who have trouble with focusing or fidgeting (such as those with ADHD;autism;or anxiety) by acting as a release mechanism for nervous energy or psychological stress. Experts were divided on this claim;with some supporting it while others disputed its scientific basis and argued the toy may actually be more distracting. Although they were invented in the 1990s;fidget spinners became popular toys in 2017. Often marketed with claims of health benefits;the toy began being used by school children;resulting in some schools banning the spinners;arguing that the toy became a distraction in classrooms. Other schools are allowing the toy to be used discreetly by children;presumably to help them concentrate.